Restore ability to use v1 CA if trusted locally

ChangeLog

@@ -41,6 +41,8 @@ Bugfix
      rejected with CBC-based ciphersuites and TLS >= 1.1
    * Very large records using less padding could cause a buffer overread of up
      to 32 bytes with CBC-based ciphersuites and TLS >= 1.1
+   * Restore ability to use a v1 cert as a CA if trusted locally. (This had
+     been removed in 1.3.6.)
 
 = PolarSSL 1.3.7 released on 2014-05-02
 Features

library/x509_crt.c

@@ -1589,17 +1589,25 @@ static int x509_wildcard_verify( const char *cn, x509_buf *name )
  * Return 0 if yes, -1 if not.
  */
 static int x509_crt_check_parent( const x509_crt *child,
-                                  const x509_crt *parent )
+                                  const x509_crt *parent,
+                                  int top )
 {
-    if( parent->version == 0 ||
+    /* Parent must be the issuer */
-        parent->ca_istrue == 0 ||
+    if( child->issuer_raw.len != parent->subject_raw.len ||
-        child->issuer_raw.len != parent->subject_raw.len ||
         memcmp( child->issuer_raw.p, parent->subject_raw.p,
                 child->issuer_raw.len ) != 0 )
     {
         return( -1 );
     }
 
+    /* Parent must have the basicConstraints CA bit set.
+     * Exception: v1/v2 certificates that are locally trusted. */
+    if( parent->ca_istrue == 0 &&
+        ! ( top && parent->version < 3 ) )
+    {
+        return( -1 );
+    }
+
 #if defined(POLARSSL_X509_CHECK_KEY_USAGE)
     if( x509_crt_check_key_usage( parent, KU_KEY_CERT_SIGN ) != 0 )
         return( -1 );
@@ -1643,7 +1651,7 @@ static int x509_crt_verify_top(
 
     for( /* trust_ca */ ; trust_ca != NULL; trust_ca = trust_ca->next )
     {
-        if( x509_crt_check_parent( child, trust_ca ) != 0 )
+        if( x509_crt_check_parent( child, trust_ca, 1 ) != 0 )
             continue;
 
         /*
@@ -1770,7 +1778,7 @@ static int x509_crt_verify_child(
          grandparent != NULL;
          grandparent = grandparent->next )
     {
-        if( x509_crt_check_parent( parent, grandparent ) == 0 )
+        if( x509_crt_check_parent( parent, grandparent, 0 ) == 0 )
             break;
     }
 
@@ -1872,7 +1880,7 @@ int x509_crt_verify( x509_crt *crt,
     /* Look for a parent upwards the chain */
     for( parent = crt->next; parent != NULL; parent = parent->next )
     {
-        if( x509_crt_check_parent( crt, parent ) == 0 )
+        if( x509_crt_check_parent( crt, parent, 0 ) == 0 )
             break;
     }
 

tests/data_files/server1-v1.crt

@@ -0,0 +1,19 @@
+-----BEGIN CERTIFICATE-----
+MIIDITCCAgkCDFOitscEzU2OvIALwTANBgkqhkiG9w0BAQsFADBQMRwwGgYDVQQD
+ExNQb2xhclNTTCBUZXN0IENBIHYxMRAwDgYDVQQLEwd0ZXN0aW5nMREwDwYDVQQK
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+krj+Z18pcrssO+Etv0BOiPjmU9TWWpDMj34ef7U/OH5qJxkSrA==
+-----END CERTIFICATE-----

tests/data_files/server2-v1-chain.crt

@@ -0,0 +1,38 @@
+-----BEGIN CERTIFICATE-----
+MIIDFTCCAf0CDFOittkjXbxFc/m3bDANBgkqhkiG9w0BAQsFADBOMRowGAYDVQQD
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+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----
+MIIDITCCAgkCDFOitscEzU2OvIALwTANBgkqhkiG9w0BAQsFADBQMRwwGgYDVQQD
+ExNQb2xhclNTTCBUZXN0IENBIHYxMRAwDgYDVQQLEwd0ZXN0aW5nMREwDwYDVQQK
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+krj+Z18pcrssO+Etv0BOiPjmU9TWWpDMj34ef7U/OH5qJxkSrA==
+-----END CERTIFICATE-----

tests/data_files/server2-v1.crt

@@ -0,0 +1,19 @@
+-----BEGIN CERTIFICATE-----
+MIIDFTCCAf0CDFOittkjXbxFc/m3bDANBgkqhkiG9w0BAQsFADBOMRowGAYDVQQD
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+-----END CERTIFICATE-----

tests/data_files/test-ca-v1.crt

@@ -0,0 +1,19 @@
+-----BEGIN CERTIFICATE-----
+MIIDIzCCAgsCDFOito4FQA5VXJOV5TANBgkqhkiG9w0BAQsFADBQMRwwGgYDVQQD
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+-----END CERTIFICATE-----

tests/suites/test_suite_x509parse.data

@@ -622,6 +622,18 @@ X509 Certificate verification #69 (RSASSA-PSS, wrong mgf_hash)
 depends_on:POLARSSL_PEM_PARSE_C:POLARSSL_X509_RSASSA_PSS_SUPPORT:POLARSSL_SHA256_C
 x509_verify:"data_files/server9-bad-mgfhash.crt":"data_files/test-ca.crt":"data_files/crl.pem":"NULL":POLARSSL_ERR_X509_CERT_VERIFY_FAILED:BADCERT_NOT_TRUSTED:"NULL"
 
+X509 Certificate verification #70 (v1 trusted CA)
+depends_on:POLARSSL_PEM_PARSE_C:POLARSSL_RSA_C:POLARSSL_PKCS1_V15:POLARSSL_SHA256_C
+x509_verify:"data_files/server1-v1.crt":"data_files/test-ca-v1.crt":"data_files/crl.pem":"NULL":0:0:"NULL"
+
+X509 Certificate verification #71 (v1 trusted CA, other)
+depends_on:POLARSSL_PEM_PARSE_C:POLARSSL_RSA_C:POLARSSL_PKCS1_V15:POLARSSL_SHA256_C
+x509_verify:"data_files/server2-v1.crt":"data_files/server1-v1.crt":"data_files/crl.pem":"NULL":0:0:"NULL"
+
+X509 Certificate verification #72 (v1 chain)
+depends_on:POLARSSL_PEM_PARSE_C:POLARSSL_RSA_C:POLARSSL_PKCS1_V15:POLARSSL_SHA256_C
+x509_verify:"data_files/server2-v1-chain.crt":"data_files/test-ca-v1.crt":"data_files/crl.pem":"NULL":POLARSSL_ERR_X509_CERT_VERIFY_FAILED:BADCERT_NOT_TRUSTED:"NULL"
+
 X509 Parse Selftest
 depends_on:POLARSSL_SHA1_C:POLARSSL_PEM_PARSE_C:POLARSSL_CERTS_C
 x509_selftest: